Intel® 64 and IA-32 Architectures Optimization Reference Manual

USING PERFORMANCE MONITORING EVENTSMetricReads Non-prefetchfrom the ProcessorAll WC from theProcessorTable B-5. Performance Metrics - Bus (Contd.)DescriptionNumber of all readtransactions (includesRFOs but excludesprefetches) on the busthat originated fromthis processorBeware of granularityissues with this event.Also Beware ofdifferent recipes inmask bits for Pentium4 and Intel Xeonprocessors betweenCPUID model fieldvalue of 2 and modelvalue less than 2.Number of WriteCombining memorytransactions on thebus that originatedfrom this processorBeware of granularityissues with this event.Also Beware ofdifferent recipes inmask bits for Pentium4 and Intel Xeonprocessors betweenCPUID model fieldvalue of 2 and modelvalue less than 2.Event Name or MetricExpressionIOQ_allocationIOQ_allocationEvent Mask ValueRequired1a. ReqA0, ALL_READ,OWN (CPUID model = 2).2: Enable edgefiltering 1 in theCCCR.1a. ReqA0, MEM_WC,OWN (CPUID model = 2)2: Enable edgefiltering 1 in theCCCR.B-19